/Engine/Plugins/Developer/Concert/ConcertMain/Source/Concert/Public/IConcertSession.h
typedef TMulticastDelegate_ThreeParams< void, [IConcertClientSession](API\Plugins\Concert\IConcertClientSession) &, [EConcertClientStatus](API\Plugins\Concert\EConcertClientStatus), const [FConcertSessionClientInfo](API\Plugins\Concert\FConcertSessionClientInfo) & > FOnConcertClientSessionClientChanged